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ADC0817CCN Folha de dados(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças ADC0817CCN
Descrição Electrónicos  8-Bit uP Compatible A/D Converters with 16-Channel Multiplexer
Download  13 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC0817CCN Folha de dados(HTML) 7 Page - National Semiconductor (TI)

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Timing Diagram (Continued)
The successive approximation register (SAR) performs 8
iterations to approximate the input voltage. For any SAR
type converter, n-iterations are required for an n-bit con-
verter.
Figure 2 shows a typical example of a 3-bit converter.
In the ADC0816, ADC0817, the approximation technique is
extended to 8 bits using the 256R network.
The A/D converter’s successive approximation register
(SAR) is reset on the positive edge of the start conversion
(SC) pulse. The conversion is begun on the falling edge of
the start conversion pulse. A conversion in process will be
interrupted by receipt of a new start conversion pulse. Con-
tinuous conversion may be accomplished by tying the
end-of-conversion (EOC) output to the SC input. If used in
this mode, an external start conversion pulse should be
applied after power up. End-of-conversion will go low be-
tween 0 and 8 clock pulses after the rising edge of start
conversion.
The most important section of the A/D converter is the
comparator. It is this section which is responsible for the
ulimate accuracy of the entire converter. It is also the com-
parator drift which has the greatest influence on the repeat-
ability of the device. A chopper-stabilized comparator pro-
vides the most effective method of satisfying all the
converter requirements.
The chopper-stabilized comparator converts the DC input
signal into an AC signal. This signal is then fed through a
high gain AC amplifier and has the DC level restored. This
technique limits the drift component of the amplifier since the
drift is a DC component which is not passed by the AC
amplifier. This makes the entire A/D converter extremely
insensitive to temperature, long term drift and input offset
errors.
Figure 4 shows a typical error curve for the ADC0816 as
measured using the procedures outlined in AN-179.
www.national.com
7


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